Eraser-cleaning apparatus



I i J Jun 8,9Z9- A. E. OTTERSTROM' ET AL 1.718.180

I ERASER CLEANING APPARATUS Filed July 26, 1926 L= 1E-J IHIII AUJEPT E UfiEI'sTI- um.

Patented June 18, 1929.

STTS

ALBERT E. OTTERfiTROI/I AND FRITZ LANDIN, OF KASOTA, MINNESOTA.

ERASER-CLEANING APPARATUS. i

Application filed July 26, 1926.

The present invention relates to cleanrng apparatus, and the primary object of the invention is to provide a cleaner particularly well adapted for use in the cleaning of blackboard erasers.

A further object of the invention is to provide an improved eraser cleaning apparatus which may be operated in a manner whereby the chalk dust removed from the erasers may be conveyed from the cleaner and into an ordinary chimney away from the person operating the cleaner.

A further object of the invention is to provide an eraser cleaning apparatus whereby a number of the erasers may be cleaned at one time, and which apparatus is of such construction as to eliminate the necessity of providing an enclosure for the apparatus for preventing the escape of the chalk dust when removed from the erasers.

A further object of the invention resides in the provision of an eraser cleaning apparatus embodying a novel driving arrangement whereby the drum for receiving the erasers is rotated by a belt ,or the like engaging the peripheral face of the drum.

A further object of the invention resides in the provision of'an eraser cleaner embodying a drum being open at both ends, and having a hood so associated with one end of the 'drum as to permit of the chalk dust being entrapped in the hood and conveyed to a chimney solely by the natural draft created by the chimney.

Other objects and advantages of the invention will be apparent during the course of the following 'detaileddescription, taken in connection with theaccompanying drawing forming a partof this specification and in which drawing: Y

Figure 1 is a side elevation of theimproved cleaner apparatus and showing'the same connected with an ordinary chimney thru which the-chalk dust removed from the erasers being cleaned will be conveyed due to the nat ural draft created in the chimney.

Figure 2 is a fragmentary central longitudinal. section thru the improved cleaner.

Figure 3 is a transverse section on line 3-3 of Figure 1 and looking in the direction of the arrows.

Figure 4 is a detail plan view of the outer or rear side of the companion sections forming the collector hood for the exit end of the cleaner drum.

Referring to the drawing in detail, and wherein similar reference characters desig- Serial No. 125,029.

nate corresponding parts throughout the several views, the letter A designates a suitable support for rotatable mounting of a cleaner drum B, C a driving means for rotating of the drum B, and D a collector hood arranged at the exit end of the drum B for conveying of the chalk dust to a suitable chimney or flue E.

Referring to the support A, the same embodies a suitable base plate 5 upon which is mounted as by suitable supporting legs 6, an open rectangular shaped frame 7. The side and end rails 8 and 9 respectively of the frame 7, are preferably of angle shape in cross section, with their vertical flanges connected with the upper'ends of the legs 6 as by suitable fastening elements 10.

Mounted centrally and upon the upper horizontally disposed flanges of each end rail 9, is a suitable bearing block 11 for rotatable n'iounting of a shaft 12 which extends parallcl with the side rails 8. This shaft 12 serves as a means for mounting of the 'drum B within the open frame 7.

Referring to the cleaner drum B, the same embodies a cylindrical shaped body portion 13 being closed at its entrance and exit ends by means of wire screenings 14; and 15 respectively. The mountings 16 for each end of the drum, and which are disposed inwardly of the screened end walls 14 and 15,'embody rim portions 17 connected by means of radially extending spokes 18 with hubs 19. The shaft 12 is adapted to extend thru the aligning hubs 19, and suitable means such as a set screw 20 may extend thru one of the hubs 19 fol-rigidly connecting the cleaner drum for rotation with the shaft 12. Secured to the body portion 13, and extending longitudinally of the body portion to each of the drum mountings 16, is a' plurality of spaced apart elevating or tumbling rails or ribs 21 which when the drum is revolving, will elevate and tumble the erasers about within the drum in a manner for removing the chalk dust from the eras'ers'.

The rim portions 17 of the drum mountings 16., contact at their outer peripheral faces with the inner peripheral face of the body portion 13, and thus form shallow pockets at each end of the body portionfor preventing any excess accumulation ofchalk dust from bein dumped at the ends of the drum. Thesorim portions 17 also serve as an anchoring means for the marginal edges of the screens 1% and 15, while the disc like portions of the hubs 19 serve as means for rigidly curing the hub portions of the screens to their respective hubs of the drum mountings. The screens 14c and mayv be secured to the rims and hubs as by soldering, welding or the like.

A nut 22 is preferably turned upon the 7 forward end of the shaft 12 and engages the outer faceof the bearing 11, for retaining of the drum mounting 16 at the forward end of the drum in engagement with the inner face of the forward bearing and preventing longitudinal shifting of the cleaner drum within theframe 7. The drum B is of less length than the length of the rectangular shaped frame 7 and when so mounted as illustrated in Figure 2, the rear or exit end of the drum is spaced a distance from the rear bearing 11.

Referring to the driving means C for rotating thedrum B, the same embodies an arch support 25 having its ends securcdto the forward portions of the side rails 8 and extend ing in arched spaced relation above the forward orentrance end of the drum B. A suitable-bearing 26 is carried by the crown of the arched support 25 for rotatable mounting of a counter, shaft 27 which extends parallel with the main shaft 12 for mounting the cleaner drum. Mounted upon the forward projecting end of the counter shaft 27,. is a largepull'ey wheel 28 about which a suitable drive belt 29 is trained for connection with the. shaft of an electric motor 80 suitably mounted upon a forwardly projecting portion of the base plate 5. Mounted upon the rearwardly projecting end of the counter shaft 27,'is a relatively small pulley 31 for receiving a flat rotating, belt 32 whichv is trained about the peripheral face of the body.

portion 13 0f the cleaner drum B. Thus it will be seen that the pulleys 28 and 31 act. as a speed reducing means whereby the drum B will not be rotated at an excessive speed.

Referring now to the collector hood D which is disposed at the rear or exit endof the cleaner. drum B, the same is formed in two sections, providing an upper section 35, and the lower section 36. Referring first to the upper hood section 35, the sameembodies a semi-circular shaped end wall 37' and a semi cylindrical' shaped flange portion 38 having laterall extending ears 39 formed at each end thereof and extending parallel with the lower edge of the end wall 37. A conductor pipe 40 is connected at the crown of the flange portion 88, and is-connected by means of'a suitable pipe 42 into the flue of the chimney E, If desirable, a suitable valve lg'may be provided in the conductor pipe 40 for-regulatingthe amount of draft or suction created thru the cleaner drum B. Formed upwardly into the end wall 37 at the center of thelower edge thereof, is an elongated slot 44' ofa width equal to the diameter of the main shaft 12 for. supporting of the cleaner drum. The lower section 36 of the collector hood, embodies a semi-circular shaped end wall 45 which is inclined upwardly and rearwardly throughout the greaterportion of its height, and terminates in a flat portion 46. The section 36 also embodies a semi-cylindrical shaped flange portion 1-? having radially extending ears 48 provided at its upper end and disposed below the top edge of the flat portion 46 as clearly illustrated in Figure 4-. Forinedcentrally of the upper edge of the flat portion L6, is a downwardly extending slot 49 for receiving the shaft 12. The cars 89 and 48 of the sections 35 and 36 respectively, are apertured and are adapted to bedisposed in superposed relation upon the side rails S-ftor receiving suitable fastening bolts 50 which serve for retaining the sections in assembled relation and securing of the hood to the frame 7 at the rear or exit end of the cleaner drum with a portion of the semi.-cy lindrical shaped flange portions 38 and 17 overlying in spaced relation, the rear portion of the main body portion 13. When the sections 35 and 36 are in assembled relation, the upwardly projecting flat portion of the lower section extends inwardly of the lower portion of the end wall 87 of the upper section, with the aligning slots fand 19 receiving the main shaft 12 in a manner whereby the rear wall of the collector hood will be closed against liability of the chalk dust passing thru the oint between the separable sec tions. By so forming the hood in separable sections, such will permit the hood being readily associated with the exit end of the cleaner drum without first removing the drum from its mounting inthe frame 7; By so having the end wall 4-5 of the lower section 36inclined upwardly and rearwardly away; from the exit end of the drum B, such will cause the chalk dust passing from the lower portion of the drum during rotation, to be directed upwardly into the conductorapipe 4:0. A suitable door may be provided in the main body portion 13' of the drum, between two adjacent elevating 'rails,'for permitting of ready placing and removal ofthe erasers from the cleaner drum. This door 60 is preferably hinged atone of 'the elevating rails, and has its free end overlying the adjacent elevatingrail in a manner as illustratedin Figure 3, for preventing the door from being moved inwardly of the drum.

From the foregoing description it will. be apparent'that an extremely novel andsimple eraser cleaning apparatus has been provided embodying a revoluble member having screens provided at both ends thereof, with'a collector hood arranged over the exit ends of the revoluble member and connected with a suitable flue whereby the natural draft cre ated in the flue serves for removing the-chalk dust from the revoluble member Changes in detail may be made to the-specific form of the invention herein shown and described, without departing from the spirit of the invention or the scope of the following claims.

WVe claim:

1. An eraser cleaning apparatus comprising a supporting frame embodying end and side rails, a drum revolubly mounted upon the end rails and having screens arranged at each end thereof for permitting air to freely pass longitudinally thru the drum, an arched support carried by the forward ends of the side rails and extending above the forward end of said drum, a counter shaft mounted at the crown of the arched support, pulley wheels carried by the counter shaft forwardly and rearwardly of the support, means connected with the forward pulley for rotating of the counter shaft, a belt trained over the rear pulley and the peripheral face of said drum for rotation of the drum, and a collector hood provided with a conductor pipe at its upper end, arranged in overlying relation at the rear end of the drum and supported by the side rails of said frame.

2. In a cleaning apparatus, the combination with a supporting frame and a drum re.-

volubly mounted upon the frame and having screens arranged at each end thereof, of a collector hood embodying upper and lower section-s, said upper section being provided with a semi-circular end wall and a semi-cylindrical shaped flange portion having ears provided at each end thereof, and sald lower section embodying an upwardly and rearthereof, said ears to be secured to the supporting frame with the flange portions of the sections overlying in spaced relation one end of the drum, and a lead off conductor pipe extending from the upper end of said upper collector hood section.

3. An eraser cleaning apparatus comprising a frame embodying end and side rails, a shaft mounted at its ends on the end rail-s, a drum fixedly mounted on the shaft between the end rails and having screens closing each end thereof, said drum being mounted on the shaft with its rear end in spaced relation from one end rail, means for rotating the shaft, and a two-part collector hood having the sections thereof mounted upon the side rails of the frame at the spaced end of the drum including end walls having portions overlapping at the juncture of the sections and having flange portions surrounding the. adjacent end of the drum in slightly spaced relation thereto, the upper section of the hood being provided with a conductor pipe leading from the upper end of the section.

ALBERT E. OTTERSTROM. FRITZ LANDIN. 

